Bug 64327

Summary:	kernel doesn't honor O_SYNC on open
Product:	[Retired] Red Hat Public Beta	Reporter:	David Mansfield <bugzilla>
Component:	kernel	Assignee:	Larry Woodman <lwoodman>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	pensacola	CC:	sct
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2002-05-02 17:17:47 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description David Mansfield 2002-05-02 15:01:48 UTC

From Bugzilla Helper:
User-Agent: Mozilla/5.0 Galeon/1.2.0 (X11; Linux i686; U;) Gecko/20020308

Description of problem:
I have a test benchmark that I've been running on various systems.  When I run
it on pensacola, it scores about 1500% better, but it's because it isn't
honoring the O_SYNC on open.  I can verify this because: 

1) the score is the same with or without the flag
2) adding an fdatasync() call slows it down to the same level as
on other systems
3) I/O continues long after the process has terminated, and ps shows kupdated
doing the writing.


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. open a file with O_SYNC and notice that it's not.
2.
3.
	

Actual Results:  asynchronous file writes

Expected Results:  synchronous file writes

Additional info: